1. You should write down your age, height and weight on the paper. Looking at them, introduce yourself.

2. Yous should write down the information about your age, height and weight on the paper. With them, introduce yourself.

3. You should write down the numbers related to your age, height and weight on the big sheet. Showing them to the classmates, introduce yourself.

(Would you check the passages? Correct errors, please.)

1. You should write down your age, height, and weight on the paper. Looking at them, introduce yourself.

It's fine.

2. You should write down the information about your age, height, and weight on the paper. With them, introduce yourself.
It's fine, too, but wordy. I like the first one better.

3. You should write down the numbers related to your age, height, and weight on the big sheet. Showing them to your classmates, introduce yourself.
Grammatically, it's OK, but very wordy. #1 is still the best!

1. You should write down your age, height, and weight on a piece of paper. Once you have written them down, you can use these details to introduce yourself. For example, you could say, "Hi, my name is [Your Name]. I am [Your Age] years old, [Your Height] tall, and weigh [Your Weight]. Nice to meet you!"

2. You should write down your age, height, and weight on a piece of paper. After writing them down, you can use this information to introduce yourself. For instance, you could say, "Hello, my name is [Your Name]. I am [Your Age] years old, [Your Height] tall, and weigh [Your Weight]. It's a pleasure to meet you!"

3. You should write down the numbers that represent your age, height, and weight on a large sheet of paper. Then, you can show these numbers to your classmates in order to introduce yourself. You could say, "Hey, everyone! My name is [Your Name]. I am [Your Age] years old, [Your Height] tall, and weigh [Your Weight]. Nice to make your acquaintance!"